Drill.



C. A|` DEMPSEY.

DRILL.

APPLICATION FILED II\.N.20,1014` Patented Dec. 15, 1914.

ATTORN EY UNITED sTATEs PATENT oEEICE.

CHARLES A. DEMPsEmnor/iwnsr CHICAGO, ILLINIs, .assIGNon or ONE-HALF To JOHN F. FowLEn, or WEST CHICAGO, ILLINOIS.

DRILL;

Spemation of Ltts Iiate'nt.

Patented Dec. 15, 1914.

Application led January 20, 19'14: Serial No. 818,283.

Toall whom it may concern e it known that I, CHARLES A. DEMPSEY, a citizen of the United States, residing at Test Chicago, in the county of Dupage and State of Illinois, have invented a new and useful Drill, of which the following is a specification.

The invention relates to improvements in drills.- e I The object of the present invention is to improve the construction of well drills, and to provide a simple, efficient and inexpensive safety device adapted to Cover and protect an entire string of tools, and capable in event of breakage of any portion of the string above the point to which its lower end is applied of enabling the tools to be jarred up and removed from the well.

A further object of the invention is to provide a safety device of this character adapted to strengthen a string of tools, maintain them in a straight line and 'enable a straight hole' to be bored and at the same time prevent foreign matter, such as rock, sand, sediment, etc., from getting between the links of the jars and lookin or interfering with the operation thereof.

With these and other objects in view, the invention consists in the construction and novel combination of parts hereinafter fully described, illustrated in the accompanying drawing, and pointed out in the claims hereto appended; it being understood that various changes in the form, proportion, size and minor details of construction, within the scope of the claims, may be resorted to without departing'from the spirit or sacrificing any of the advantages ofthe invention. A

In the drawing Figure 1 is an elevation of a string of tools equipped with a safety device, constructed in accordance with this invention, the safety device being in section. Fi 2 is an enlarged sectional view of the sa ety device. Fig. 3 is an enlarged detail view of the upper portion of the rope socket. Fig. 4 is a similar view of a portion of the bit.

Like numerals of reference designate corresponding parts in all the gures of the drawing.

In the accompanying drawing in which is illustrated the preferred embodiment of the invention, the safety device comprises in construction, comprises the bit 3, the rope socket 4, a stem 5 vand jars 6 Composed of links and operable in the usual manner. The bit 8 is provided at its upper portion with a threaded boss 7 and the coupling sleeve or member 2, 'which is preferably cylindrical, as shown, is provided at its lower end with interior screw threads 8 to engage the threaded boss 7 of the bit 3, whereby the coupling sleeve is connected with the bit. The upper portion of the coupling sleeve 2 is provided with interior screw threads 9 and the lower end portion 10 of the safety sleeve or tube is exteriorly threaded to screw into the threaded portion of the coupling sleeve or member 2. The safety sleeve or casing 1, which is of a length to cover the entire string of tools, is designed to be constructed of two or more sections having their contiguous terminals l1 exteriorly threaded for the reception of an interiorly threaded coupling 12, but the safety tube or casing may be constructed in a single piece or any otherA desired number of sections.

The upper end 18 of the safety sleeve or casing 1s provided with exterior screw threads 14 and is equipped with an interiorly threaded ca 15. The cap, which consists of a cylindrica body, has the interior threads 16 at its lower portion, and it is provided at its upper end with an outwardly tapered neck or portion 17 having a smooth reduced mouth or opening 18 through which passes the neck 19 of the rope socket 4. The neck 19 is extended to form a guide for the upper end or portion of the safety sleeve or casing, the upper cap 17 constituting the slidable connection between the casing or sleeve 1 and the neck, which is adapted to receive the friction and wear incident to the slidable connection between the safety device and the string of tools. This arrangement relieves the rope or cable 20 of such wear and lessens the liability of breakage. The upper end 21 of the extended neck is arranged exteriorly of the tubular casing or protection In casea breakage occurs in any portion, of the string of drilling tools, such as thel breaking off of the pin of the bit, the breakage of the jars or the stem, or breakage at any point above .the boss of the bit where the 'safety sleeve is connected with the latter,

the fact will be indicated to the driller by the load being released from the line when the break occurs. This slackens the rope and reduces the tension thereon.` The rope socket will move upwardly in the tubular casing or safety sleeve until -it contacts with the reduced or tapered upper portion 17- of the cap 15. .The rope socket .catches at this point and provides an .extra long stroke enabling the string of tools'to be-jarred up and thereby. drawn out of the hole. The safety sleeve or `casing aords a complete for the string Aof tools and excludes rock, sand, freer motion of the jars and prevents /their operation from being interfered withv bysuch rock, sand, mud,vetc. Also in event of a cave-in before inserting the well casing, the tools, which would otherwise become wedged, will be protected by the casin the stroke remaining unimpaired. A perectly straight hole is assured owing to the guiding of the sleeve on the extended neck of the rope' socket. As the tools are maintained in a straight line or position by the safety sleeve .or casing, there is less. liability of a caving-in of the hole.

mud, etc., and affords a What is claimed is l. In a drill, the combination with a string of tools including a bit, and a rope socket having a neck, of a safety sleeve or casing extending the entire length of the stringl of tools and forming a housing for the same and secured at its lower end to the bit, said sleeve or casing having a slidable connection at its upper end with the neck of the rope socket.

2. In a drill, the combination with a string of tools including a bit, and a rope socket having an extended neck, of a safety sleeve or casing receivingthe string of tools and extending the entire length of the same and secured at its lower end to the bit, and a cap carried by the upper end of the sleeve or casing and 4having a reduced portionslidably arranged on the extended neck of the rope socket.l

3.' In a drill, the combination with -a string of tools including a bit having a' threaded boss, and a rope socket provided .with a neck, of la safety sleeve or casing receiving .the vstring of tools and extending from the bit tothe rope socket, a coupling sleeve carried by the lower end of the safety sleeve or casing and having an interiorly threaded portion to engage the threaded boss of the bit, and means carried by the upper end of the safety sleeve or casing for slidably connecting it with the neck of the rope socket.

In testimony, that I claim 'the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

. CHARLES-A. DEMPSEY. Witnesses:

-RAYM0ND V. ELLIOTT, DOUGLAS 'I;`. MADIsoN. 

